Pump for feeding liquid-fuel engines and like purposes



1,471 21 Oct 16 1923 E H. TARTRAIS ,2

PUMP FOR FEEDING LIQUID FUEL ENGINES AND LIKE PURPOSES F1104 Jul? 14 1921 J 17 ii. .j ZZ

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mvzmoa Epgne Henri TarTrms his HTTORNEY.

Patented Oct. 16, 1923.

UNITED STATES PATENT OFFEQE.

EUGENE HENRI TABTB-AIS, 0F MAISONS-LAFFITE, FRANCE.

PUMP FOR FEEDING LIQUID-FUEL ENGINES AND LIKE PURPOSES.

Application filed July 14, 1921.

To all whom it may concern:

Be it known that I, EUoiaNn HENRI TAR- TRAIS, citizen of the French Republic, residing at Maisons-Lafiite, Seine-et-Oise, in the Republic of France, have invented new and useful Improvements in Pumps for Feeding Liquid-Fuel Engines andlike Purposes, of which the following is a specification.

This invention relates to improvements in pumps for feeding liquid fuel engines and for like purposes of the type described in my U. S. Patent No. 1,315,648, these improvements consisting essentially in that the fuel chamber is entirely closed and forms an air chamber, the fuel being admit-- ted into the said chamber under pressure, for instance from a reservoir situated at a higher level.

The fuel chamber may be provided with a suitable plug for renewing the air in case it should become dissolved after a considerable time, and on the other hand the guide for the admission valve stem may be provided with a stuffing box to prevent all leakage of fuel.

The accompanying drawing shows by way of example: my improved pump in vertical section along the axis of the driving shaft.

As shown in the drawing, in the frame 4 of the apparatus is formed the pump barrel or cylinder 8, the driving shaft 1 is provided with two cams 2 and 3 which oper ate respectively the piston 5 and a plunger rod 12 acting by an arm 14 upon the inlet valve 9 of the pump. The fuel is discharged through the outlet valve 22 and pipe 22. The piston 5 and rod 12 are held in contact with the operating cams by the coil springs? and 13, respectively and the inlet valve 9 is closed by the coil spring 11 when said closing movement is allowed by the arm 14.

In the example herein represented, the constant level tank which is shown in the drawing of my previous patent, above referred to, is now omitted. The fuel is contained in a reservoir 42 located at a suflicient height above the level of the pump. Said fuel flows through the pipe 39 into the chamber 17 formed around the admission valve 9. Said'chamber is closed at the top by the cap 10 and has no communication with the outer air. A certain quantity of air is enclosed therein above the level of the liquid fuel X-X at a pressure corresponding to the head of the reservoir.

Serial No. 48 2,8013.

The air chamber thus formed by the cap 10 acts as a regulator in a manner which will be readily understood. When the pump exerts a suction, the air expands to a slight degree and the level X-X be comes lowered. The admission may be thus carried out without the pounding effect which is likely to occur in the case of a constant level device. A plug such as 4.0 will enable the air to be readily renewed should it have become dissolved after a long action.

The cap 10 is provided with a stufiin box 41 in order to prevent leakage of fue around the valve stem 9. Instead of causing the fuel under pressure to be admitted into the fuel chamber by bringing it from a reservoir situated at a higher level, it is obvious that any other suitable device may be employed, for instance a small supplementary gear or other pump provided if necessary with a pressure regulating valve.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A pump for feeding engines with liquid fuel comprising in combination: a pump barrel, a piston moving in said pump barrel, means for operating said piston, an inlet valve located in line with the piston axis and forming the bottom of the pump barrel, means for mechanically operating said valve and causing the same to open from inside to outside, a normally closed fuel chamber around said inlet valve and outside of the pump barrel, said fuel chamber containing fuel in its lower part and air in its upper part, means for feeding said chamber with fuel under pressure and an automatic delivery valve.

2. A pump for feeding engines with liquid fuel comprising in combination: a pump barrel, a piston moving in said pump barrel, means for operating said piston, an inlet valve located in line with the piston axis and forming the bottom of the pump barrel, means for mechanically operating said valve and causing the same to open from inside to outside, a normally closed fuel chamber around said inlet valve and outside of the pump barrel, said fuel cham ber containing fuel in its lower part and air in its upper part, a fuel reservoir lo cated at a higher level than the fuel chamher and in communication therewith and an automatic delivery valve.

3. A pump for feeding engines with liquid fuel comprising in combination: a pump barrel, a piston moving in said pump barrel, means for operating said piston, an inlet valve located in line with the piston axis and forming the bottom of the pump barrei, means for mechanically operating said valve and causing the same to open from nside to outside, a normally closed fuel charmher around said inlet valve and outside of the pump barrel, said fuel chamber containing fuel in its lower part and air in its up per part, means for feeding said chamber with fuei under pressure, removable pings in the Walls of said fuel chamber for the purpose of renewing the air and an automatic delivery valve.

4. A pump for feeding engines with liquid fuel comprising in combination: a pump barrel, a piston moving in said pump barrel,

means for operating said piston, an inlet valve located in line with the piston axis and forming the bottom of the pump barrei, means for mechanicaiiy operating said valve and causing the same to open from inside to outside, a normally closed fuel chamber around said inlet valve and outside of the pump barrel, said fuei chamber containing fuel in its lower part and air in its upper part, means for feeding said chamber with fuel under pressure, a cap closing the top 01. the fuel chamber, the stem of the inlet valve extending through said cap which carries a liquid tight guiding member surrounding said valve stem Within the fuel chamber and EUGENE HENRI TARTRAIS. 

